I'm wanting to use the DC-block block, and I have questions about its use.
My scenario is to use it as a cheap high-pass, with a corner frequency
of a few milli-hertz, with samples arriving at 50Hz.
It's not clear how the "length" parameter relates to the desired corner
frequency and sample rate.
Another approach I was considering was to use a long-time-constant
single-pole IIR, and subtract the output of that from the unmolested
sample stream.
This is for a correlation interferometer, where we want to eliminate
stability issues caused by low-level interference from satellite signals
that basically show up as slowly-varying DC, at a frequency that's about
1/10th the fringe frequency.
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